Summer and autumn vegetables using insect nets

The vegetables in summer and autumn are a variety of pests such as cabbage caterpillar, beet armyworm, diamondback moth, tobacco budworm, aphids, and Spodoptera litura. The use of insect nets during the cultivation can prevent pests from flying into the vegetable fields. The insect pests can be effectively controlled, the use of pesticides or drugs can be reduced, and the purpose of pollution reduction can be reduced. Insect-resisting nets have become an emerging model for the cultivation of vegetables, especially leafy vegetables.

First, cover the scope of application

Leafy vegetables are cultivated in open field in summer and autumn. Pests are seriously endangered, pesticides are applied in large quantities, and summer and autumn are frequent occurrences of sudden natural disasters such as heavy rain and high winds, which have a great influence on the yield. Therefore, it is possible to cover the cultivation with insect nets. Leaf vegetables produce no pollution or less pollution, achieve stable production, high yield, high quality, and high efficiency. Solanaceous vegetables, melons, and legumes are prone to viral diseases in summer and autumn, and are mainly caused by aphid-borne infections. The use of insect nets to cover cultivation can cut off the route of transmission and reduce the occurrence of viral diseases. It can also extend the harvest period of these types of vegetables, or increase cultivation in summer to meet the needs of the summer off-season market, and to enable farmers to obtain better production efficiency. At the same time, using insect net technology in summer and autumn, autumn and winter vegetables can be nursed, bred disease-free strong seedlings, the use of insect net coverage nursery, can effectively increase the emergence rate, seedling rate and seedling quality.

Second, the common form of coverage

In the production of commonly used forms of cover are the following: First, greenhouses cover cultivation, that is, insect nets directly covered on the scaffolding, surrounded by soil or brick compaction, scaffolding with a film line fastening, leaving the main entrance to expose the shed The cover facilitates access to the shed. The second is horizontal scaffolding coverage. That is to say, all vegetable fields are covered with insect nets. This covering method can save insect nets and net racks. The operator's low third is a small arch shed covering cultivation. That is, the insect-proof net is covered on the top surface of the arches and tightly sealed around. Afterwards, watering is poured directly on the net until it is harvested. The width of insect nets is generally 1-2.4m, which can be used according to the actual situation. It is most suitable for the summer and autumn greenhouses to cover the insect nets with 18-22 mesh silver grey nets. For example, the body length of general locusts is 2.3-2.6mm; the length of the diamondback moth is 6-7mm, and the length of the wings is 12-15mm. Therefore, 18-25 meshes of vegetable production can prevent adults from entering the net.

Third, the use of technical points

The cultivation of vegetable pest nets is a highly technical work. The following points should be noted technically: soil disinfection and chemical weeding should be done. This is an important supporting measure for covering cultivation. Before covering the insect net, it must kill the pests and germs that remain in the soil and block its transmission route. Soil treatment before sowing can be controlled with 5% butyl thiocarbacarb 2 kg or 50% phoxim 1000 times solution per 667 m2; use Green Hunter 1 No. 3 000 times solution or Green Hunter No. 2 600-800 times solution. Prevention of soil-borne diseases. When the small arch covers the cultivated vegetables, the height of the arch shed should be higher than the height of the crop to prevent the leaves from adhering to the insect net, to prevent pests from eating outside the net, or to lay eggs on the leaves, and to check the damage of the insect nets in time. Block holes and gaps. The second is to implement the full growth period coverage. Insect nets do not shading much, and there is no need to uncover the night cover or cover it. The general wind does not have to use the press cable. If it meets the 5-6 wind, you must pull the cable to prevent it from being blown by the wind. Third, pay attention to supporting measures. Insect nets cover cultivation time is mainly in the summer and high temperature season, should pay attention to the selection of heat and disease resistant vegetable varieties, the application of high-quality organic fertilizers and biological pesticides, reasonable planting density, the eggplant and melon vegetables to pruning, thinning fruit, do a good job Change crops, improve water systems, etc. Fourth, spray water cooling. When the temperature of white pest control nets is high, the net temperature and ground temperature in the net are about 1°C higher than those outside the net. Therefore, when the air temperature is particularly high in July and August, the frequency of watering can be increased and the humidity in the net can be maintained to cool down. Fifth, after the use of insect nets, they are promptly removed. After cleaning, they are rolled up and placed in a cool place to extend the service life and reduce production costs.

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